Perfex Series 155 Magic Dial Thermostat
Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Thrush System of Hot Water Heating
H. A. Thrush & Company of Peru, Indiana published this book for contractors about the Thrush System of Hot Water Heating. There's no date on it, but it's most likely from the 1930s.
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